Abstract
Lanthanum(III) and cerium(III) complexes of pyridine-2,6-dicaboxylic acid (H2Pydc) have been prepared and their crystal structures were determined by X-ray crystallography. The single crystal analysis reveals that the lanthanum(III) complex, 1 is polymeric consisting of {[La(Pydc)2(H2O)2]·4H2O} n units linked through carboxylate oxygen atoms and exhibiting nine coordination number. Intermolecular O–H···O hydrogen bonds produce R 11 (6), R 44 (16) and R 44 (20) rings, which lead to three-dimensional polymeric chains. The crystal structure of the cerium(III) complex, 2 [{Ce(Pydc)3}{Ce(Pydc)(HO–CH2CH2–OH)(H2O)3}·6H2O)] shows that the complex is a mixed-ligand binuclear system in which one cerium coordinated to three Pydc molecules, while the other cerium is bound to one Pydc, one oxygen atom of the other Pydc, one ethylene glycol and three water molecules. Each of the two Ce(III) ions is nine coordinated. Intermolecular O–H···O hydrogen bonds produce R 22 (8) and R 22 (20) rings, which lead to three-dimensional polymeric chains. The complexes were further investigated using elemental analysis, FTIR spectroscopy and thermogravimetric analysis.
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Acknowledgments
The authors acknowledge the Higher Education Commission of Pakistan for the purchase of diffractometer under the Grant of Strengthening of the Materials Chemistry Laboratory at GC University, Lahore, Pakistan. Authors also gratefully acknowledge the Higher Education Commission, Islamabad, Pakistan for its financial support under its Indigenous PhD Program batch (VI) and Charles Wallace Pakistan Trust for granting Doctoral Bursary at the University of Oxford.
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Sharif, S., Khan, I.U., Şahin, O. et al. Synthesis and Crystal Structures of a Lanthanum(III) 1D Polymer and a Mixed-Ligand Cerium(III) Binuclear Complex Derived from Pyridine-2,6-dicaboxylic Acid. J Inorg Organomet Polym 22, 1165–1173 (2012). https://doi.org/10.1007/s10904-012-9715-7
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DOI: https://doi.org/10.1007/s10904-012-9715-7